41results about How to "Change electrical length" patented technology

An antenna is constituted in which a variable capacitance capacitor portion Ct is connected between an antenna element and a ground. In the variable capacitance capacitor, a plurality of variable capacitance elements using a thin film dielectric layer whose dielectric constant is changed by a voltage applied are connected in parallel with regard to direct current component and in series with regard to high frequency component between an antenna-element-side terminal and a ground-side terminal. The capacitance change ratio of the variable capacitance capacitor that depends on the bias signal can be utilized to the maximum so as to perform impedance matching so that the electrical length of the antenna element is changed, and thus, the operating frequency can be changed. In addition, the antenna having small waveform distortion and intermodulation distortion, high power handling capability and low loss at high frequencies can be realized.

The present invention relates to a cross-band frequency-conversion antenna based on an intelligent paper folding structure, belonging to the field of frequency reconfigurable antennas. The antenna comprises a substrate, an antenna arms, a coaxial feeder, a radio frequency coaxial connector and a RF signal emitter; the substrate employs a self-locking square-twist folding structure; the middle portion of the substrate is provided with a cross-line hole, the two antenna arms are symmetrically glued and fixed at the upper side plate surface of the substrate, the initiating terminal of each antenna arm is extended outwards from the cross-line hole, each antenna arm is located the panel overlapping position for ducking in a folding state; the initiating terminals of the antenna arms are respectively connected with two output ports of the RF signal emitter through the coaxial feeder via the radio frequency coaxial connector, and output signal phase difference of two ends of the RF signal emitter is 180 degrees. The antenna can be subjected to self unfolding through heating to change working frequency, the influence of frequency modulation on performances of the antenna is little, the frequency tuning amplitude is large, and cross of different wave bands can be achieved.

The surface mount type antenna in which a radiation electrode having a predetermined resonant frequency is formed on a substrate can be easily manufactured. Electrodes (11) are formed on the entire surface (10a), end surface (10b), back surface (10c) and end surface (10d) of four continuous surfaces of a dielectric substrate (10). Cutting is then performed with a cutting machine to form a slit (4) intersecting the direction α connecting the end surface (10b) and the end surface (10d) on the electrode (11) on the surface (10a) of the dielectric substrate (10). Then, the dielectric substrate (10) is cut into multiple pieces along the α direction to make multiple surface-mounted antennas (1) approximately surrounded by the radiation electrodes (3) formed on the rectangular parallelepiped base (2). A plurality of surface mount antennas (1) can be produced at one time. The shape of the radiation electrode (3) (electrode 11) is simple, and the cutting machine can be processed with high precision. Therefore, by cutting the narrow slit (4) with a cutting machine, the radiation electrode (3) having a set resonance frequency can be easily formed. ).

The invention provides an antenna, an adjustment method thereof, and a mobile terminal, which relate to the technical field of communication and are used to solve the problem in the prior art that the adjustment of the antenna is not flexible enough to affect the radiation performance of the antenna. The antenna includes: a metal back shell ground, a metal radiation sheet, and an insulating medium connecting the metal back shell ground and the metal radiation sheet; a liquid metal adjustment part is provided in the insulating medium, and the liquid metal adjustment part includes Insulated pipe; the insulated pipe is in the shape of a zigzag between the metal back shell and the metal radiation sheet multiple times, wherein each turning point of the insulated pipe is in contact with the metal back shell or the metal radiation sheet contact; the pipe wall at each turning point is provided with an opening, and the opening is sealed by the metal back shell or the metal radiation sheet; the middle section of the insulating pipe is loaded with liquid metal, and the two ends of the insulating pipe Together with the liquid metal, a section of gas is enclosed in each case.

The invention discloses a phase adjustment device and a phase adjustment unit. The phase adjustment device includes a shielding cavity and a signal circuit board fixedly arranged in the shielding cavity; the signal circuit board includes a base material and a signal strip line arranged on the base material; the signal strip line It includes a signal transmission line arranged in a first direction; the phase adjustment device also includes a sliding medium closely arranged on the signal circuit board, and an operating rod that can drive the sliding medium to slide in a second direction; the The operating end of the operating rod extends out of the shielding cavity and is in the same direction as the moving direction of the sliding medium; when the sliding medium moves in the second direction, the electrical length of the signal transmission line is continuously changed. Through the same direction movement of the operating rod and the sliding medium, the electrical length of the signal transmission line is continuously changed to achieve the adjustment effect, and has the advantages of simple structure and high reliability.